Results 331 to 340 of about 383,519 (362)

Guanidine and Amidine Organocatalysts for Ring-Opening Polymerization of Cyclic Esters

, 2006
1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD), N-methyl-TBD (MTBD), and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) are effective organocatalysts for the ring-opening polymerization (ROP) of cyclic esters such as lactide (LA), δ-valerolactone (VL), and e ...
B. Lohmeijer, R. Pratt, Frank A. Leibfarth, J. W. Logan, David A. Long, A. P. Dove, F. Nederberg, Jeongsoo Choi, C. Wade, R. Waymouth, J. Hedrick   +10 more
semanticscholar   +1 more source

Rate constants for hydrogen abstraction by HȮ2 from n‐butanol

, 2012
Rate constants of hydrogen-atom abstraction from n-butanol by the HȮ2 radical have been calculated. Conventional transition state theory employing rigid-rotor harmonic-oscillator approximations for all but the torsional degrees of freedom is used with ...
Chong-Wen Zhou, J. Simmie, H. Curran
semanticscholar   +1 more source

Dissociation constants of thiophencarboxylic acids: calculation of ? constants for the thiophen ring

Journal of the Chemical Society B: Physical Organic, 1970
Dissociation constants for a number of substituted thiophen-5-carboxylic acids have been determined and used to evaluate σ constants for the thiophen molecule. The values obtained are in excellent agreement with those calculated by the method of Dewar and Grisdale and indicate that the sulphur atom has very little effect upon the transmission of ...
openaire   +2 more sources

Complementary Split-Ring Resonators for Measuring Dielectric Constants and Loss Tangents

IEEE Microwave and Wireless Components Letters, 2014
Chieh-Sen Lee, Chin-Lung Yang
semanticscholar   +1 more source

Conformational analysis of the sugar ring in nucleosides and nucleotides. Improved method for the interpretation of proton magnetic resonance coupling constants.

Journal of the American Chemical Society, 1973
C. Altona, M. Sundaralingam
semanticscholar   +1 more source

CODATA recommended values of the fundamental physical constants: 2018

Reviews of Modern Physics, 2021
Barry N Taylor, David B Newell, Peter J Mohr   +2 more
exaly  

Generating conjectures on fundamental constants with the Ramanujan Machine

Nature, 2021
Yaron Hadad, Ido Kaminer
exaly  

264. Ionization constants of heterocyclic substances. Part II. Hydroxy-derivatives of nitrogenous six-membered ring-compounds

, 1956
A. Albert, J. Phillips
semanticscholar   +1 more source

A Forgotten Tree Ring Record [PDF]

Science, 1934
openaire   +4 more sources

Design of an add filter and a 2-channel optical demultiplexer with high-quality factor based on nano-ring resonator

Journal of Computational Electronics, 2019
Gholamali Delphi, S. Olyaee, M. Seifouri, Ahmad Mohebzadeh-Bahabady   +3 more
semanticscholar   +1 more source